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Atsonupuri volcano

stratovolcano 1206 m / 3,957 ft
Iturup Island, Kuril Islands, 44.81°N / 147.14°E
Current status: dormant (1 out of 5)
Atsonupuri volcano books
Typical eruption style: explosive
Atsonupuri volcano eruptions: 1932, 1812 No recent earthquakes
TimeMag. / DepthDistanceLocation
Atsonupuri volcano is a mostly basaltic stratovolcano in the southern Kurile Islands, Russia, located ca. 150 km NE of Hokkaido, Japan.
Atsonupuri volcano forms a prominent peninsula at the SW side of Iturup Island connected by a 30 m low isthmus. The volcano has often had strombolian eruptions such as its historic eruptions and produced a few lava flows.

Background:

Atsonupuri volcano has a somma volcano (the remnant of an older edifice) whose rim is exposed at 900 m elevation on the SE side. The precessor of Atsonupuri was active in the late Pleistocene or early Holocene and once formed an island up to about 1.5 km high, which was later connected to Iturup Island by sediments.
An important normal fault cuts through the NW side of the somma of Atsonupuri (also known as Etorofu-Atosanupuri).
The 2-km-wide caldera was largely filled and overtopped by a central cone that forms the present-day summit.


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